Merge pull request #319 from typelevel/update/sbt-scala-native-crossproject-1.3.0

Update sbt-scala-native-crossproject to 1.3.0

Author: rossabaker

project/plugins.sbt

@@ -4,4 +4,4 @@ addSbtPlugin("org.typelevel" % "sbt-typelevel-site" % sbtTypelevelVersion)
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.4.4")
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.11.0")
 addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.9")
-addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.2.0")
+addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.3.0")